GazT4R and Pyaap (Gary and Ashok) have swapped 2.5 R engines for the 2.4 so may be worth asking how they got on. Their cars are R's though so probably not quite the same degree of change involved as you plan. They both make more power out of the 2.4 than the 2.5 for the reasons outlined. I would talk to a software supplier before committing to a motor that isn't compatible with your ecu. MTE have developed a custom map for the Stock 2.4 engine (FMIC, Aquamist and DP/Exhaust) that Ashok dyno'd at 350+bhp back in the summer. The 2.5 engines are a weak link in the Volvo line up and fail in their Ford cousins too. It is misleading to point fingers of blame at any of the tuners who supply software for the late model R engines as the liner failures happen to owners of vehicles with stock maps.
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